/*
===========================================================================
This source file is part of DyLab (Dynamic Laboratory)
For the latest info, see http://code.google.com/p/dylab/

Copyright (c) 2006-2008 Lukas Krejci
(krejci.lukas@volny.cz)

This file is part of DyLab.

    DyLab is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    DyLab is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with DyLab.  If not, see <http://www.gnu.org/licenses/>.
===========================================================================
*/

#ifndef __dylab_Singleton_h__
#define __dylab_Singleton_h__

//===========================================================================================
#include <dylab/utils/exceptions/EAssertionFailed.h>

//===========================================================================================
namespace dylab {

    /** 
     * 
     */    
    template < 
        class _ClassT
    >
    class Singleton
    {
    private:

        ///
        static _ClassT * s_mSingleton;

    public:

        /**
         *
         */
        Singleton()
                { 
                    DYLAB_ASSERT(s_mSingleton == NULL);
                    s_mSingleton = static_cast<_ClassT*>(this);
                }

        /**
         *
         */
        virtual ~Singleton()
                { 
                    DYLAB_ASSERT(s_mSingleton != NULL);
                    s_mSingleton = NULL;
                }

        /**
         *
         */
        static _ClassT & getSingleton()
                { 
                    DYLAB_ASSERT(s_mSingleton != NULL);
                    return *s_mSingleton; 
                }
    };

    template <class _ClassT> _ClassT * Singleton<_ClassT>::s_mSingleton = NULL;
}

//===========================================================================================
#endif // __dylab_Singleton_h__
